<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 消息提示 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 信息表单 -->
      <!-- label-position="top" 让属性名称在输入框的上面 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!-- tab栏 -->
        <!-- :before-leave="beforeTabLeave"监听tab栏标签页的切换 -->
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 选择商品分类的级联选择框 -->
              <el-cascader
                v-model="addForm.goods_cat"
                expandTrigger="hover"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="butAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 预览图片框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
    <img :src="previewPath" alt="">
    </el-dialog>
  </div>
</template>

<script>
// 导入lodash
import _ from 'lodash'
export default {
  data() {
    return {
      // 步骤条的激活项
      activeIndex: '0',
      // 添加商品表单的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 存放图片临时路径对象
        pics: [],
        // 商品的介绍
        goods_introduce:'',
        // 商品的参数（数组），包含 动态参数 和 静态属性
        attrs:[],
      },
      // 商品基本信息表单的校验规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类数据存放数组
      cateList: [],
      // 级联选择框的属性配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 存放动态参数
      manyTableData: [],
      // 存放静态属性
      onlyTableData: [],
      // 图片上传请求地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 给图片上传设置请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewVisible:false,
      previewPath:''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) this.$message.error('获取商品分类数据失败')
      this.cateList = res.data
    },
    // 当级联选择框发生变化时触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // tab栏标签页切换时触发
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // tab栏点击时触发
    async tabClicked() {
      //  判断是否是动态参数
      if (this.activeIndex === '1') {
        const {
          data: res,
        } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' },
        })
        if (res.meta.status !== 200) this.$message.error('获取参数失败')
        // 将数据中attr_vals渲染成，拼接的数组
        res.data.forEach((item) => {
          // 判断attr_vals是否有值
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        // 静态属性调接口获取
        const {
          data: res,
        } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' },
        })
        if (res.meta.status !== 200) this.$message.error('获取参数失败')
        this.onlyTableData = res.data
      }
    },
    // 图片上传成功触发
    handleSuccess(response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
    },
    // 图片移除触发
    handleRemove(file) {
      // 存储临时路径
      const filePath = file.response.data.tmp_path
      // 获取索引
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 调用splice移除
      this.addForm.pics.splice(i, 1)
    },
    // 图片点击预览
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    add(){
      // 提交表单前的预验证
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid) return this.$message.error('请输入完整表单项')
        // 添加逻辑
        // 首先深拷贝一份提交参数
        const form = _.cloneDeep(this.addForm)
        // 首先把分类列表goods_cat转换成 , 分割的字符串，之前是数组
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item=>{
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item=>{
          console.log(item)
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals
          }
        this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
    
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.butAdd {
  margin-top: 15px;
}
</style>
